Setting up a new C++ project usually requires a significant amount of preparation and boilerplate code, even more so for modern C++ projects with tests, executables and continuous integration. This template is the result of learnings from many previous projects and should help reduce the work required to setup up a modern C++ project.
- Modern CMake practices
- Suited for single header libraries and projects of any scale
- Clean separation of library and executable code
- Integrated test suite
- Continuous integration via GitHub Actions
- Code coverage via codecov
- Code formatting enforced by clang-format and cmake-format via Format.cmake
- Reproducible dependency management via CPM.cmake
- Installable target with automatic versioning information and header generation via PackageProject.cmake
- Automatic documentation and deployment with Doxygen and GitHub Pages
- Support for sanitizer tools, and more
Adjust the template to your needs
- Use this repo as a template.
- Replace all occurrences of "Greeter" in the relevant CMakeLists.txt with the name of your project
- Capitalization matters here:
Greetermeans the name of the project, while
greeteris used in file names.
- Remember to rename the
include/greeterdirectory to use your project's lowercase name and update all relevant
- Capitalization matters here:
- Replace the source files with your own
- For header-only libraries: see the comments in CMakeLists.txt
- Add your project's codecov token to your project's github secrets under
- Happy coding!
Eventually, you can remove any unused files, such as the standalone directory or irrelevant github workflows for your project. Feel free to replace the License with one suited for your project.
To cleanly separate the library and subproject code, the outer
CMakeList.txt only defines the library itself while the tests and other subprojects are self-contained in their own directories. During development it is usually convenient to build all subprojects at once.
Build and run the standalone target
Use the following command to build and run the executable target.
cmake -Hstandalone -Bbuild/standalone cmake --build build/standalone ./build/standalone/Greeter --help
Build and run test suite
Use the following commands from the project's root directory to run the test suite.
cmake -Htest -Bbuild/test cmake --build build/test CTEST_OUTPUT_ON_FAILURE=1 cmake --build build/test --target test # or simply call the executable: ./build/test/GreeterTests
To collect code coverage information, run CMake with the
Use the following commands from the project's root directory to check and fix C++ and CMake source style. This requires clang-format, cmake-format and pyyaml to be installed on the current system.
cmake -Htest -Bbuild/test # view changes cmake --build build/test --target format # apply changes cmake --build build/test --target fix-format
See Format.cmake for details.
Build the documentation
cmake -Hdocumentation -Bbuild/doc cmake --build build/doc --target GenerateDocs # view the docs open build/doc/doxygen/html/index.html
To build the documentation locally, you will need Doxygen, jinja2 and Pygments on installed your system.
Build everything at once
The project also includes an
all directory that allows building all targets at the same time. This is useful during development, as it exposes all subprojects to your IDE and avoids redundant builds of the library.
cmake -Hall -Bbuild cmake --build build # run tests ./build/test/GreeterTests # format code cmake --build build --target fix-format # run standalone ./build/standalone/Greeter --help # build docs cmake --build build --target GenerateDocs
The test and standalone subprojects include the tools.cmake file which is used to import additional tools on-demand through CMake configuration arguments. The following are currently supported.
Sanitizers can be enabled by configuring CMake with
-DUSE_SANITIZER=<Address | Memory | MemoryWithOrigins | Undefined | Thread | Leak | 'Address;Undefined'>.
Static Analyzers can be enabled by setting
-DUSE_STATIC_ANALYZER=<clang-tidy | iwyu | cppcheck>, or a combination of those in quotation marks, separated by semicolons. By default, analyzers will automatically find configuration files such as
.clang-format. Additional arguments can be passed to the analyzers by setting the
Ccache can be enabled by configuring with
-DUSE_CCACHE=<ON | OFF>.
Can I use this for header-only libraries?
I don't need a standalone target / documentation. How can I get rid of it?
Simply remove the standalone / documentation directory and according github workflow file.
Can I build the standalone and tests at the same time? / How can I tell my IDE about all subprojects?
To keep the template modular, all subprojects derived from the library have been separated into their own CMake modules. This approach makes it trivial for third-party projects to re-use the projects library code. To allow IDEs to see the full scope of the project, the template includes the
all directory that will create a single build for all subprojects. Use this as the main directory for best IDE support.
I see you are using
GLOBto add source files in CMakeLists.txt. Isn't that evil?
Glob is considered bad because any changes to the source file structure might not be automatically caught by CMake's builders and you will need to manually invoke CMake on changes. I personally prefer the
GLOB solution for its simplicity, but feel free to change it to explicitly listing sources.
I want create additional targets that depend on my library. Should I modify the main CMakeLists to include them?
Avoid including derived projects from the libraries CMakeLists (even though it is a common sight in the C++ world), as this effectively inverts the dependency tree and makes the build system hard to reason about. Instead, create a new directory or project with a CMakeLists that adds the library as a dependency (e.g. like the standalone directory). Depending type it might make sense move these components into a separate repositories and reference a specific commit or version of the library. This has the advantage that individual libraries and components can be improved and updated independently.
You recommend to add external dependencies using CPM.cmake. Will this force users of my library to use CPM as well?
CPM.cmake should be invisible to library users as it's a self-contained CMake Script. If problems do arise, users can always opt-out by defining
CPM_USE_LOCAL_PACKAGES, which will override all calls to
find_package. Alternatively, you could use
CPMFindPackage instead of
CPMAddPackage, which will try to use
find_package before calling
CPMAddPackage as a fallback. Both approaches should be compatible with common C++ package managers without modifications, however come with the cost of reproducible builds.
Can I configure and build my project offline?
Using CPM, all missing dependencies are downloaded at configure time. To avoid redundant downloads, it's recommended to set a CPM cache directory, e.g.:
export CPM_SOURCE_CACHE=$HOME/.cache/CPM. This will also allow offline configurations if all dependencies are present. No internet connection is required for building.
Can I use CPack to create a package installer for my project?
As there are a lot of possible options and configurations, this is not (yet) in the scope of this template. See the CPack documentation for more information on setting up CPack installers.
This is too much, I just want to play with C++ code and test some libraries.
Perhaps the MiniCppStarter is something for you!
- Script to automatically adjust the template for new projects